When nitric acid reacts with metals, hydrogen gas is not observed because:

Hydrogen gas is not released

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Hydrogen is oxidised by nitric acid

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Metals weakly react with nitric acid

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Nitric acid vaporises upon contact with the metal

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Solution

The correct option is B
Hydrogen is oxidised by nitric acid

Nitric acid is a strong oxidising agent. So as soon as hydrogen gas is formed in the reaction between a metal and nitric acid, the nitric acid oxidises hydrogen gas to water and gets reduced to any of the nitrogen oxides. Thus nitric acid does not release hydrogen gas upon reaction with metals.

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